It's honestly never necessary to comment on "what an entire species is like" from the perspective of the characters in a story being told. The only reason we get this sort of thing in TTRPGs is that the books are often written from a "word of god" perspective and are trying to sum up things that should probably be more complex than they are presented.
But PF2 has gotten away from that to its credit. Now we're talking about "what these orcs here are like" not "what all orcs everywhere are like." It's never necessary for a sourcebook to comment on all orcs past, present and future, on all continents, and all planets. What the Sarusan orcs are like has no bearing on what the Belkzen orcs are like. What the goblins on far away planets are like has no bearing on what the goblins in Avistan are like.
It does not seem particularly challenging to handle "the Orcs you encounter in the Darklands are unlikely to be friendly, but the Orcs you encounter in the Mwangi expanse are unlikely to be hostile" since the game you're in is unlikely to rapidly switch back and forth from those places.